Decoupling, AC Mitigation & Isolation

Cathtect USA delivers a modern generation of solid-state decouplers engineered to outperform legacy designs across AC mitigation, surge handling, and signal stability.  Built on advanced multi-stage filtering, consistently lower RMS voltage drop, and transparent unit-level documentation, our decouplers give engineers a technically superior alternative in a market long dominated by traditional approaches.  Each device reflects a focused engineering philosophy: Precision over Scale, Modern performance over legacy assumptions offering application-specific solutions for hazardous areas, survey workflows, polarization cell replacement, and transient protection.  Together, the Cathtect decoupler family raises the standard for protecting critical infrastructure in today’s AC-intensive environments.

 

Why Engineers Choose Cathtect Decouplers

Each product is built on the same advanced filtering platform but optimized for different field realities.  

  • Advanced filtering for cleaner signals and more stable AC mitigation
  • Lower RMS voltage drop (50–80% lower than competing devices)
  • High-energy surge handling up to 100 kA (10/350 µs)
  • Transparent QA with batch test results and threshold verification
  • Maintenance-free solid-state construction
  • Designed for PHMSA Mega Rule compliance
  • Built for today’s AC interference environments
Over Voltage Protector (OVP)

Over Voltage Protector (OVP)

Modern transient protection engineered for today’s cathodic protection environments.

The Cathtect USA OVP is engineered for today’s cathodic protection environments, delivering compact, solid-state transient protection that clamps lightning and switching surges without interrupting CP system continuity.  Built for across-flange installations and remote infrastructure, it provides a precise, maintenance-free discharge path only when voltage exceeds a defined threshold, all within a rugged Ex e-rated enclosure suited for space-constrained, safety-critical locations.  As a modern alternative to legacy transient devices, the OVP reflects Cathtect’s focused engineering approach – compact, precise, and purpose-built for real-world grid conditions.  While traditional suppliers rely on older architectures, Cathtect advances the category with solid-state reliability, transparent performance documentation, and application-specific design that meets the demands of modern critical infrastructure.

 

Product Highlights

  • High-energy transient clamping for lightning and switching surges
  • Optimized for across-flange protection in CP systems
  • Solid-state, maintenance-free design with no moving parts
  • Compact Ex e-rated enclosure for harsh or space-limited environments
  • Defined DC clamping ranges for precise system design
  • Unlimited switching cycles for long-term reliability
  • Field-ready documentation including batch test results and QA verification
  • Ideal for remote, sensitive, or distributed infrastructure
Over Voltage Protector (OVP) is an innovative solid-state technology designed to control and preserve Cathodic Protection currents while limiting and mitigating overvoltages or stray currents.
Solid State Decoupler (SSD) with Integrated Capacitance Isolator

Solid State Decoupler (SSD) with Integrated Capacitance Isolator

Survey-ready decoupling engineered for accurate CIS/DCVG data and safer field operations.

 

The Cathtect USA SSD with our Survey Isolation Switch is a survey-ready decoupling solution engineered for accurate CIS/DCVG data and safer field operations.  Built on the same solid-state architecture as the hazardous SSD, it integrates an external isolation switch that temporarily removes the decoupler’s reactive capacitance from the circuit – eliminating waveform distortion during interrupted surveys while keeping the CP system online.  Housed in a customized Fat Fink aluminum test-station enclosure, it delivers precise survey performance, safe operation, and streamlined workflows for integrity teams working under PHMSA Mega Rule requirements.  As a modern alternative to legacy decouplers that distort survey signals or require unsafe field bypassing, the SSD + Switch reflects Cathtect’s commitment to solutions designed for today’s operational realities, not yesterday’s limitations.

 

Product Highlights

  • Accurate CIS/DCVG surveys with no capacitive distortion
  • Reactive elements isolated without removing or bypassing the decoupler
  • CP stays online – DC threshold protection remains active during surveys
  • Operator-safe switching with no exposure to live terminals or arcing
  • Preserved AC mitigation to avoid voltage spikes during survey mode
  • Fault-rated isolation switch matched to the decoupler’s current capacity
  • Double-insulated switch design with arc diffusion and venting
  • Mounted in a Fat Fink test station for easy access and field durability
  • Advanced AC filtering shared across Cathtect’s decoupler family
  • Maintenance-free solid-state construction

*Please use the Filter option below to narrow specifications, or browse the table list of standard SSD decoupler units we offer.

Innovative Solid-State technology that controls and preserves Cathodic Protection currents, limits and mitigates overvoltage’s or stray currents.

Polarization Cell Replacement Decoupling Device (DCD)

Polarization Cell Replacement Decoupling Device (DCD)

High-performance decoupling engineered for demanding AC mitigation and modern CP environments.

 

The Cathtect USA DCD is a solid-state polarization cell replacement engineered for the most demanding cathodic protection and AC mitigation environments.  Designed to isolate DC while providing a continuous, low-impedance path for AC fault, lightning, and steady-state currents, the DCD delivers the highest level of performance in Cathtect’s decoupler family.  Its advanced multi-stage filtering architecture provides sharper attenuation of unwanted frequencies, reduced harmonic interference, and more stable system behavior under fluctuating AC conditions.  Built for critical infrastructure, high-risk environments, and regulatory-driven installations, the DCD offers a maintenance-free alternative to electrochemical polarization cells – delivering superior AC mitigation, cleaner signal paths, and reliable DC isolation across the full operating range.  As the modern standard in decoupling, the DCD redefines what a polarization cell replacement can be.  While legacy solid-state decouplers rely on basic filtering and older design philosophies, the DCD introduces lower RMS voltage drop, enhanced filtering precision, and more consistent mitigation stability.  It is the modern alternative for operators who expect more from their decoupling systems – more precision, more transparency, and more performance.

 

Product Highlights

  • High-performance AC mitigation with ultra-low impedance
  • Advanced multi-stage filtering for cleaner signals and reduced harmonic interference
  • Consistently lower RMS voltage drop (50–80% lower than competing devices)
  • High-energy surge handling with 100 kA (10/350 µs) direct-strike capability
  • Defined DC clamping thresholds for precise system design
  • Stable performance under fluctuating AC loads
  • Maintenance-free solid-state construction
  • Available in Ex e hazardous-rated and NEMA 6/6P non-hazardous enclosures
  • Unit-level QA documentation including batch test results and threshold verification

Polarization Cell Replacement devices conduct once a predetermined voltage has been attained. Once conducting, they maintain the predetermined volt drop across the device.

Solid State Decoupling device (SSD)

Solid State Decoupling device (SSD)

Compact hazardous-area decoupling with advanced AC filtering for modern CP systems.

The Cathtect USA SSD is a compact, hazardous-rated solid-state decoupler engineered to provide safe DC isolation while allowing AC fault, lightning, and steady-state currents to pass to ground.  Built for installations where space, cost, and hazardous-area compliance matter, it delivers the same advanced filtering architecture found across Cathtect’s decoupler family – ensuring low impedance, stable AC mitigation, and predictable performance under fluctuating conditions.  Its Ex e-rated enclosure, maintenance-free construction, and streamlined footprint make it ideal for insulating joints, grounding interfaces, and AC mitigation points in hazardous environments.  As a modern alternative to legacy decouplers that haven’t evolved with today’s AC interference challenges, our hazardous SSD brings advanced filtering and solid-state reliability to a compact, cost-effective form factor designed for real-world CP systems.

 

Product Highlights

  • Safe DC isolation with AC fault and lightning diversion
  • Advanced AC filtering for lower RMS voltage drop and stable mitigation
  • Low AC impedance (~3 mΩ typical, 0.04 Ω guaranteed) with unit-level QA
  • Robust current handling including 45 A continuous and 60 A for 15 minutes
  • Direct-strike surge capability (100 kA, 10/350 µs)
  • Defined DC clamping ranges for precise system design
  • Compact, hazardous-rated Ex e enclosure
  • Maintenance-free solid-state architecture
  • Field-ready documentation including batch test results and QA verification

*Please use the Filter option below to narrow specifications, or browse the table list of standard SSD decoupler units we offer.

SSD’s functions as a DC voltage level clamping device in buried pipeline and storage tank systems. It can, at the same time, mitigate AC voltage.

Marine Decoupler

Marine Decoupler

The solid-state 30AMP or 50AMP De-coupling devices are a solid-state DC isolation/AC grounding devices designed for Marine applications in cathodically protected equipment.

  • The units are easily mounted and connected to the ground wire for yachts and boats to eliminate anode current loss to the AC dock power grounding system saving up to 40% of the anode current loss.
  • This De-coupling device will save you on premature anode replacement.

Solid-state DC isolation/AC grounding devices designed for Marine applications in cathodically protected equipment.

Zinc Ribbon AnodeGradient Control mat

Gradient Control Mat

Gradient control and earthing mat for CP and AC mitigation.

Range of Mat options and types

  • Copper Mats, Wire & Grids.
  • Zinc Ribbon
  • Galvanized Steel Mats

Ground control mats are ideal in situations that have voltage differences between structures. Gradient control mats are installed around above ground pipeline structures to protect workers from potentially hazardous (Step & Touch) voltages that can be present on pipelines and metallic Structures.

Features and Characteristics

  • Low-cost design
  • Fast construction using 4ft x 8ft sheets and exothermic welding
  • Avoids handling and bending of zinc ribbon
  • Low inductance design limits step and touch potentials due to lightning and AC faults
  • Data available on design life and anode selection.
Add to Estimate

Gradient control mats are ideal in situations that have voltage differences between structures which could potentially be hazardous for workers.

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We welcome all enquiries concerning our products & services.